Travel on Kikapu Deluxe '04

Considering the purchase of an '04 kikapu deluxe but a bit confused. I believe kona advertises 100mm of rear travel. According to my calculations, that comes out to something along the lines of 3.91 inches of travel.
Then I hear people say to "wait for the 2005 model because it will have 4 inches of travel".

What gives here? I'm confused, are people really that excited for an extra .09 inches of travel on the rear? Or am I calculating something wrong here? hmmm......